A major quantitative trait locus for increasing cadmium-specific concentration in rice grain is located on the short arm of chromosome 7.
A major quantitative trait locus for increasing cadmium-specific concentration in rice grain is located on the short arm of chromosome 7.
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DOI：
10.1093/jxb/erp360
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发表时间：
2010-03
影响因子：
6.9
通讯作者：
Yano M
中科院分区：
文献类型：
--
作者：
Ishikawa S;Abe T;Kuramata M;Yamaguchi M;Ando T;Yamamoto T;Yano M
已观察到稻谷和芽中镉 (Cd) 浓度存在较大的表型变化。然而，人们对镉积累的遗传控制仍知之甚少。确定了决定镉污染稻田中水稻籽粒镉浓度的数量性状基因座（QTL）。使用由 85 个来自低 Cd 积累品种 Sasanishiki（粳稻）和高 Cd 积累品种 Habataki（籼稻）杂交的回交自交系组成的作图群体，在 2 号和 7 号染色体上发现了两个增加籽粒 Cd 浓度的 QTL。 7号染色体），在7号染色体的短臂上检测到。它占回交自交系所有表型变异的35.5%。 qGCd7 与任何必需微量金属（铜、铁、锰和锌）浓度的 QTL 或抽穗期等农艺性状的 QTL 没有遗传相关性，表明该 QTL 是 Cd 特有的。此外，使用染色体片段替换系（CSSL）和目标 CSSL 与生长在镉污染水稻土中的 Sasanishiki 杂交的 F2 群体证实了 qGCd7 的存在。据我们所知，qGCd7 是一个新的 QTL，对提高籽粒 Cd 浓度具有重要作用。
Large phenotypic variations in the cadmium (Cd) concentration of rice grains and shoots have been observed. However, the genetic control of Cd accumulation remains poorly understood. Quantitative trait loci (QTLs) determining the grain Cd concentration of rice grown in a Cd-polluted paddy field were identified. Using a mapping population consisting of 85 backcross inbred lines derived from a cross between the low-Cd-accumulating cultivar Sasanishiki (japonica) and high-Cd-accumulating cultivar Habataki (indica), two QTLs for increasing grain Cd concentration were found on chromosomes 2 and 7. A major-effect QTL, qGCd7 (QTL for grain Cd on chromosome 7), was detected on the short arm of chromosome 7. It accounted for 35.5% of all phenotypic variance in backcross inbred lines. qGCd7 was not genetically related to any QTLs for concentrations of essential trace metals (Cu, Fe, Mn, and Zn) or those for agronomic traits such as heading date, suggesting that this QTL is specific to Cd. Furthermore, the existence of qGCd7 was confirmed using chromosome segment substitution lines (CSSLs) and an F2 population from a cross between the target CSSL and Sasanishiki grown in a Cd-polluted paddy soil. To our knowledge, qGCd7 is a novel QTL with major effects for increasing grain Cd concentrations.
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影响因子：
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